Hello again, Zsolt Benke! Now that I have more knowledge, I have tried to review your system again. However, I do not use physical context tags in my GTD, nor do I carry work tasks to my personal GTD area, so separating between personal and work does not help me.

I have a "traditional" system with an agenda, tickler file, projects, waiting, without using smart lists. However, the only problem I have is adding project tasks to next actions. For now, I am doing it manually and tagging those tasks with the project tag, and thus doing a weekly follow-up, that there is a task per project in next actions.

I hope that Apple updates Reminder, without being Things 3, but that it adds some more function to solve this.